1 /*
2 * Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24 /* @test
25 @bug 4452020 4629048 4638365 4869859
26 * @summary Test FileChannel scattering reads
27 * @run main/othervm ScatteringRead
28 */
29
30 import java.nio.channels.*;
31 import java.nio.*;
32 import java.io.*;
33
34 public class ScatteringRead {
35
36 private static final int NUM_BUFFERS = 3;
37
38 private static final int BUFFER_CAP = 3;
39
40 private static final int BIG_BUFFER_CAP = Integer.MAX_VALUE / 3 + 10;
41
42 public static void main(String[] args) throws Exception {
43 test1(); // for bug 4452020
44 test2(); // for bug 4629048
45 System.gc();
46
47 // Test 3 proves that the system is capable of reading
48 // more than MAX_INT bytes in one shot. But it is unsuitable
49 // for automated testing because oftentimes less bytes are
50 // read for various reasons, and this is allowed by the spec.
51 // test3(); // for bug 4638365
52 }
53
54 private static void test1() throws Exception {
55 ByteBuffer dstBuffers[] = new ByteBuffer[NUM_BUFFERS];
56 for (int i=0; i<NUM_BUFFERS; i++)
57 dstBuffers[i] = ByteBuffer.allocateDirect(BUFFER_CAP);
58 File blah = File.createTempFile("blah1", null);
59 blah.deleteOnExit();
60 createTestFile(blah);
61
62 FileInputStream fis = new FileInputStream(blah);
63 FileChannel fc = fis.getChannel();
64
65 byte expectedResult = -128;
66 for (int k=0; k<20; k++) {
67 long bytesRead = fc.read(dstBuffers);
68 for (int i=0; i<NUM_BUFFERS; i++) {
69 for (int j=0; j<BUFFER_CAP; j++) {
70 byte b = dstBuffers[i].get(j);
71 if (b != expectedResult++)
72 throw new RuntimeException("Test failed");
73 }
74 dstBuffers[i].flip();
75 }
76 }
77 fis.close();
78 }
79
80 private static void createTestFile(File blah) throws Exception {
81 FileOutputStream fos = new FileOutputStream(blah);
82 for(int i=-128; i<128; i++)
83 fos.write((byte)i);
84 fos.flush();
85 fos.close();
86 }
87
88 private static void test2() throws Exception {
89 ByteBuffer dstBuffers[] = new ByteBuffer[2];
90 for (int i=0; i<2; i++)
91 dstBuffers[i] = ByteBuffer.allocateDirect(10);
92 File blah = File.createTempFile("blah2", null);
93 blah.deleteOnExit();
94 FileOutputStream fos = new FileOutputStream(blah);
95 for(int i=0; i<15; i++)
96 fos.write((byte)92);
97 fos.flush();
98 fos.close();
99
100 FileInputStream fis = new FileInputStream(blah);
101 FileChannel fc = fis.getChannel();
102
103 long bytesRead = fc.read(dstBuffers);
104 if (dstBuffers[1].limit() != 10)
105 throw new Exception("Scattering read changed buf limit.");
106 fis.close();
107 }
108
109 private static void test3() throws Exception {
110 // Only works on 64 bit Solaris
111 String osName = System.getProperty("os.name");
112 if (!osName.startsWith("SunOS"))
113 return;
114 String dataModel = System.getProperty("sun.arch.data.model");
115 if (!dataModel.startsWith("64"))
116 return;
117
118 ByteBuffer dstBuffers[] = new ByteBuffer[NUM_BUFFERS];
119 File f = File.createTempFile("test3", null);
120 f.deleteOnExit();
121 prepTest3File(f, (long)BIG_BUFFER_CAP);
122 RandomAccessFile raf = new RandomAccessFile(f, "rw");
123 FileChannel fc = raf.getChannel();
124 MappedByteBuffer mbb = fc.map(FileChannel.MapMode.READ_WRITE, 0,
125 BIG_BUFFER_CAP);
126 for (int i=0; i<NUM_BUFFERS; i++) {
127 dstBuffers[i] = mbb;
128 }
129 fc.close();
130 raf.close();
131
132 // Source must be large
133 FileInputStream fis = new FileInputStream("/dev/zero");
134 fc = fis.getChannel();
135
136 long bytesRead = fc.read(dstBuffers);
137 if (bytesRead <= Integer.MAX_VALUE)
138 throw new RuntimeException("Test 3 failed "+bytesRead+" < "+Integer.MAX_VALUE);
139
140 fc.close();
141 fis.close();
142 }
143
144 static void prepTest3File(File blah, long testSize) throws Exception {
145 RandomAccessFile raf = new RandomAccessFile(blah, "rw");
146 FileChannel fc = raf.getChannel();
147 fc.write(ByteBuffer.wrap("Use the source!".getBytes()), testSize - 40);
148 fc.close();
149 raf.close();
150 }
151
152 }